Recently I went to Halloween Horror Nights at universal studios and when I came home, I noticed a couple highly red blotches on my legs, specifically on my left leg anywhere below my knee. They burn a lot, specifically to the touch and and even more under running water. If I scratch them or something, they become slightly swollen but feel very warm. This exact same thing happened last year when I went there as well, and the blotches when away after about a week. This has never happened to me before except for these two occasions. I'm really curious as to what this could be, any ideas would be appreaciated. Thanks!